🌿 1. Introduction
Hey NEET aspirants 👋
In this chapter, we explore how the plant kingdom evolved — from simple algae to the most advanced flowering plants.
Let’s simplify this complex classification into visual charts + memory codes + NEET PYQs.
🌊 2. Basis of Classification
Plants are classified based on:
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Thallus organization
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Vascular tissue presence
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Seed formation
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Flower formation
💡 Simple → Complex Evolution: Algae → Bryophytes → Pteridophytes → Gymnosperms → Angiosperms.
🧬 3. Major Divisions of Plant Kingdom
| Group | Key Feature | Example | NEET Tip |
|---|---|---|---|
| Algae | Aquatic, simple, no vascular tissue | Spirogyra, Volvox | ~1 Q/year |
| Bryophytes | Amphibians of the plant kingdom | Riccia, Moss | Require water for fertilization |
| Pteridophytes | First vascular plants | Fern, Selaginella | Sporophyte dominant |
| Gymnosperms | Naked seeds | Cycas, Pinus | No fruit formation |
| Angiosperms | Covered seeds, flowers present | Mango, Wheat | Most evolved group |
🌸 4. Alternation of Generations
-
Two phases:
🌿 Sporophyte (2n) — produces spores
🌱 Gametophyte (n) — produces gametes -
Both alternate regularly → life cycle balance.
🧠 Mnemonic: “Spores → Gametes → Spores again 🌿”
🌻 5. Angiosperm Subdivision
-
Monocots: 1 cotyledon, parallel venation, fibrous roots.
🌾 Example: Wheat, Maize. -
Dicots: 2 cotyledons, reticulate venation, taproot.
🌸 Example: Mango, Pea.
📘 6. PYQs
Q1. Amphibians of plant kingdom are —
✅ Bryophytes
Q2. First vascular plants are —
✅ Pteridophytes
Q3. Seed-bearing, non-flowering plants are —
✅ Gymnosperms
🌟 7. Quick Summary
🌿 Evolution Line: Algae → Bryophytes → Pteridophytes → Gymnosperms → Angiosperms
🧠 Mnemonic: “All Boys Play Good Always.”
💧 Water dependence decreases with evolution.